Method and device for testing micro-tensile mechanical properties of metal fiber

Abstract

The invention discloses a method and a device for testing micro-tensile mechanical properties of a metal fiber. Being different from the existing tensile tester, the invention is characterized in that a force transducer is composed of a non-contact photoelectric displacement transducer and an elastic element, the force transducer can be used for measuring both the tensile force of a fiber and the displacement of the gripped end of the fiber and helping automatically and accurately obtain the tensile force-deformation curve of a test sample in real time so as to obtain the stress-strain curve of the test sample, and parameter values characterizing the micro-tensile mechanical properties of the metal fiber can be obtained by analyzing the stress-strain curve. By using the optical non-contact measurement method, the invention avoids the interference generated by the traditional contact measurement, and enables the measuring system to be more stable. Besides, the whole device has the advantages of ingenious structure, simple and convenient operation and stable performance, thereby being applicable to testing the micro-tensile mechanical properties of various single fibers (especially metal fibers).

Description

technical field [0001] The invention belongs to the field of precise measurement of mesoscopic mechanical properties of materials, in particular to a method and device for accurately measuring the micro-tensile mechanical properties of metal fibers. Background technique [0002] As an interdisciplinary subject of solid mechanics and material science, mesomechanics is of great significance to the study of material mechanical behavior in the laws of material science. In the past ten years, the new material micron-scale ultra-fine metal fiber has been widely used in the fields of special textiles, environmental protection filtration, automobiles, papermaking and metallurgy due to its special properties such as light weight, electrical conductivity, thermal conductivity, corrosion resistance, long life and high strength. Widely used, such as the multi-lattice metal fiber felt made of metal fiber as the basic unit is not only light in weight, but also has the characteristics of s...

AI Technical Summary

Problems solved by technology

Because it is necessary to study the scale effect and related theories of metal (non-metal) fiber materials at the micron and submicron levels, it is necessary to accurately draw the stress-strain curve of the material, and the traditional strength and extensometer generally uses mechanical contact force measurement Sensor, this method of force measurement is not only disturbed by contact, but also the measured displacement (displacement of one-sided chuck) has not subtracted the deformation of the elastic element, so the traditional tensile tester cannot accurately map the stretch of the fiber material Force-deformation curves and stress-strain curves

In addition, domestic similar products appear to have complex structures and are susceptible to vibration interference due to the use of mechanical contact force measurement principles.

[0005] The same type of foreign products, such as the Instron5848 micro-force material testing machine produced by Instron in the United States, the KES-G1-SH hair tensile performance tester produced by KATO in Japan, and the British Hengs The H5K-S type fiber mechanical property tester produced by Field (Hounsfield) company also has similar problems and is expensive

[0006] In summary, the traditional textile fiber strength and elongation tester independently developed by my country is not suitable for testing the mesoscopic mechanical properties of metal fiber materials.

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